Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Pity the poor cold chisel. Misunderstood. Neglected and dull. Left to rattle around, ...

Last year, we saw [How To Make Everything’s] take on [DaVinci’s] machine for cutting threads. However, they stopped short of the goal, which was making accurate metal screw threads. After much ...